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Schach [20]
3 years ago
7

In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped

with a mean of $33 and a standard deviation of $16. Construct a confidence interval at a 98% confidence level.
Give your answers to one decimal place​
Mathematics
1 answer:
Lesechka [4]3 years ago
6 0

Answer:

The margin of error is 5. 00 

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Please help me in this question
Marrrta [24]

Answer:

option c

Step-by-step explanation:

option c is right..

3 0
3 years ago
Find the PERCENT of change.<br> 20 dogs to 5 dogs
aliya0001 [1]

Answer:

75%

Step-by-step explanation:

20-5=15 - change in numbers

15/20×100%= 75%

3 0
3 years ago
Nick bought a new car.
ira [324]

Using an exponential function, it is found that it takes 5.42 years for the car to halve in value.

<h3>What is an exponential function?</h3>

A decaying exponential function is modeled by:

A(t) = A(0)(1 - r)^t

In which:

  • A(0) is the initial value.
  • r is the decay rate, as a decimal.

In this problem, the car depreciates 12% a year in value, hence r = 0.12 and the equation is given by:

A(t) = A(0)(0.88)^t.

It halves in value at t years, for which A(t) = 0.5A(0), hence:

A(t) = A(0)(0.88)^t

0.5A(0) = A(0)(0.88)^t

(0.88)^t = 0.5

\log{(0.88)^t} = \log{0.5}

t\log{0.88} = \log{0.5}

t = \frac{\log{0.5}}{\log{0.88}}

t = 5.42.

It takes 5.42 years for the car to halve in value.

More can be learned about exponential functions at brainly.com/question/25537936

#SPJ1

9 0
2 years ago
Eric tossed two coins in the air at the same time. He recorded the results of each toss. He tossed the coins 100 times. About ho
Anna007 [38]

Answer:

25 times

Step-by-step explanation:

p(HT) p(hh) p(tt) p(HT)

h-heads

t-tails

p(hh)=(1/4*100)

25

6 0
3 years ago
Find the RANGE for the function f(x) = -4x - 9 if D = {1/2 ,0}
White raven [17]

Answer:

-11, and -9 is the range for 1/2 and 0 respectively

Step-by-step explanation:

3 0
3 years ago
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